Mysterious "halos" of rock surrounding cracks in a Martian crater may be made of water-rich opal gemstones, a new study suggests.
Timbers from the hull of a 16th-century ship have been found in a flooded quarry in southeastern England.
Many of us seek solace in comfort foods during times of stress. But what makes them so appealing?
In quantum physics, particles exist in many states at once until you measure them. Can reality really work that way?